Scholarlink

<p>This study shows that intermolecular interactions in methanol–dichloromethane (MeOH–DCM) binary solvent mixtures play a crucial role in governing the solvation dynamics of the fluorescent probe rhodamine-6G (R6G). By employing both linear (UV–Vis absorption and steady-state fluorescence) and nonlinear (two-photon-induced fluorescence, TPIF) spectroscopic techniques, we demonstrate that the combined effects of solute–solvent and solvent–solvent interactions significantly modify the local environment around R6G. Methanol, a polar protic solvent, and dichloromethane, a polar aprotic solvent, interact through hydrogen bonding and dipole–dipole interactions, creating a microenvironment with an effective polarity higher than that of either pure solvent. As a result, the absorption spectrum exhibits a noticeable red shift, accompanied by enhanced TPIF intensity and a maximum two-photon excitation action cross-section in the mixed solvent system. These findings highlight that carefully choosing and tailoring the solvent provides a simple yet practical way to effectively tune two-photon absorption behavior. Such an approach offers promising opportunities for applications in high-sensitivity bioimaging, optical materials, and photonic devices, where strong nonlinear optical responses are essential.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Linear and Nonlinear Spectroscopic Insights Into the Synergistic Solvation of Rhodamine-6G in Methanol-Dichloromethane Binary Solvent Mixture

  • 期刊论文

  • 发表日期：

    2026年5月14日

查看全文
  • Rahul Kumar Gupta,
  • Surya Kant,
  • Debabrata Goswami

摘要

This study shows that intermolecular interactions in methanol–dichloromethane (MeOH–DCM) binary solvent mixtures play a crucial role in governing the solvation dynamics of the fluorescent probe rhodamine-6G (R6G). By employing both linear (UV–Vis absorption and steady-state fluorescence) and nonlinear (two-photon-induced fluorescence, TPIF) spectroscopic techniques, we demonstrate that the combined effects of solute–solvent and solvent–solvent interactions significantly modify the local environment around R6G. Methanol, a polar protic solvent, and dichloromethane, a polar aprotic solvent, interact through hydrogen bonding and dipole–dipole interactions, creating a microenvironment with an effective polarity higher than that of either pure solvent. As a result, the absorption spectrum exhibits a noticeable red shift, accompanied by enhanced TPIF intensity and a maximum two-photon excitation action cross-section in the mixed solvent system. These findings highlight that carefully choosing and tailoring the solvent provides a simple yet practical way to effectively tune two-photon absorption behavior. Such an approach offers promising opportunities for applications in high-sensitivity bioimaging, optical materials, and photonic devices, where strong nonlinear optical responses are essential.